JPH0915629A - Liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for lessening the adverse influence of discrination by inversion of the tilt direction of liquid crystal molecules of a liquid crystal display panel provided with black matrixes in common use as Cs extending from gate bus lines alongside pixel electrodes. SOLUTION: This liquid crystal display panel has the Cs-on-Gate structure which is formed by injecting liquid crystals into the spacing between a TFT substrate connected with pixel electrodes 6, the gate bus lines 51 , drain bus lines 31 , 32 to nonlinear elements, such as TFTs 2, arranged in a matrix form and a counter substrate having common electrodes and in which the pixel electrodes are partly superposed on the part of the gate bus lines via insulating films. The panel has the structure in which the black matrix 81 in common use as Cs extends to the spacings between the drain bus lines and the pixel electrodes via the insulating films. The constitution which is arranged with the black matrix in common use as Cs between the drain bus lines 31 in the tilt direction of the liquid crystal molecules and the pixel electrodes and is not arranged with this black matrix between the drain bus lines 32 in the direction opposite to the tilt direction of the liquid crystal molecules and the pixel electrodes is adopted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel, and more particularly to a liquid crystal display panel which realizes a bright display, has improved alignment stability of liquid crystal molecules, and has high display quality and high reliability. It is something.

[0002]

2. Description of the Related Art Conventionally, in a most common normally white mode liquid crystal display panel, in order to prevent leakage of light from a gap between a pixel electrode and a drain bus line and a decrease in display contrast, a black matrix is used. A so-called light-shielding film is provided on the counter substrate in a region where leakage light occurs.

However, when aligning the area where the leaked light is generated with the black matrix, a bonding margin between the TFT substrate and the counter substrate is required, so that the area of the black matrix becomes large and, as a result, the aperture ratio decreases. ,
There has been a problem that the transmittance of the liquid crystal display panel is lowered and a bright display cannot be obtained.

Therefore, conventionally, in order to increase the electrostatic capacity between the pixel electrode and the common electrode of each liquid crystal cell to maintain the voltage applied to the liquid crystal and improve the display quality, the gate bus line of the next stage is provided. There is proposed a structure in which a black matrix is combined with a Cs-on-Gate structure in which a part of the pixel electrode and a part of the pixel electrode are overlapped with each other via an insulating film.

FIG. 11 is a plan view of a liquid crystal display panel having a conventional Cs-on-Gate structure. In this figure, 12 is a TFT, 13 is a drain, 13 ₁ and 13 ₂
Is a drain bus line, 14 is a source, 15 is a gate,
15 ₁ is a gate bus line, 16 is a pixel electrode, 18 ₁ ,
18 ₂ is a Cs / black matrix, and 19 is a counter substrate black matrix. Since this reference numeral is common to FIG. 12, a missing number is generated. The outline of a liquid crystal cell having a conventional Cs-on-Gate structure will be described with reference to this drawing.

In a conventional liquid crystal display panel having a Cs-on-Gate structure, a gate 1 is formed on a transparent substrate.
5 and the gate bus line 15 ₁ with, Cs and the black matrix 18 ₁ extending from the gate bus line 15 _1,
18 ₂ is formed, and drain bus lines 13 ₁ and 13 having a plurality of drains 13 formed thereon with a gate insulating film interposed therebetween.
₂ and a source 14 facing the drain 13 are formed to form a TFT 12 in a matrix, and a transparent pixel electrode 16 is formed by connecting to the source 14 to form a TFT substrate. The liquid crystal display panel is constructed by disposing the counter substrate having the counter substrate black matrix 19 and injecting liquid crystal into the gap between the TFT substrate and the counter substrate.

As shown in this figure, the Cs / black matrix (Cs forming portion) 18 ₁ and 18 ₂ extending from the gate bus line 15 _{1 are connected} to the drain bus line 13 ₁ at the previous stage (upper stage in this figure). , 13 ₂ provided in parallel with the pixel electrode 16 and the drain bus lines 13 ₁ , 13
Shields the gap between ₂ to form a capacitance by having an overlap with the pixel electrode 16 at the same time.

[0008]

FIG. 12 shows a conventional Cs.
Sectional view of a liquid crystal display panel having a -on-Gate structure
It is. This figure shows a cross section taken along the line AA 'in FIG.
11 is a transparent insulating film, 13₁, 13_TwoIs a drain bath
Line, 16 is a pixel electrode, 17 is an insulating film, 18₁, 18
_TwoIs Cs and a black matrix, and 20 is a liquid crystal molecule.
You. Since this code is the same as in Fig. 11, a missing number is generated.
It is the same. This figure shows the conventional Cs-on-Gate
Outline of operation of liquid crystal display panel with structure and solutions
Explain the task.

In a conventional liquid crystal display panel having a Cs-on-Gate structure, Cs / black matrices 18 ₁ and 18 ₂ are formed on the upper surface of a transparent substrate, and a drain is formed via an insulating film 17 formed thereon. Bus line 1
3 ₁ and 13 ₂ are formed, the pixel electrode 16 is formed on the upper surface of the transparent insulating film 11, and the pixel electrode 16 on the upper surface of the transparent insulating film 11 is formed.
Liquid crystal having liquid crystal molecules 20 is injected into a gap between a common electrode (not shown) of the counter substrate and the counter substrate. In this figure, the structure necessary for explaining the state of the liquid crystal molecules 20 is shown, and other structures are omitted.

In order to drive the liquid crystal display panel, a pixel electrode 16 and drain bus lines 13 ₁ and 13 ₂ are provided to a common electrode (not shown) formed on the counter substrate.
± 3 to 5 V is applied to the gate bus line (± 10 to 15 V is constantly applied to the gate bus line (not shown, but having the same potential as the Cs / black matrix 18 ₁ and 18 ₂ )).

Therefore, as shown in this figure, the Cs / black matrix 18 extending from the gate bus line is provided.
_A large lateral electric field is generated due to the potential difference between ₂ and the pixel electrode 16, and an abnormal region (right end) in which the tilt direction of the liquid crystal molecules 20 is reversed is generated. The boundary between the abnormal area and the normal area (left side) is called disclination, and leak light is generated from this boundary, which causes a reduction in contrast and unevenness, which adversely affects the display.

When the Cs / black matrices 18 ₁ and 18 ₂ are provided on the gate bus lines on both sides of the pixel electrode 16 as described above, the counter substrate black matrix must be made large in order to prevent a reduction in contrast due to disclination. As a result, this has been an obstacle to increasing the aperture ratio and improving the transmittance.

In particular, when a low threshold liquid crystal is used to reduce power consumption, the voltage of the pixel electrode 16 and the drain bus lines 13 ₁ and 13 ₂ becomes low, but the TFT is turned off.
Since the voltage of the gate bus line for turning off / off is not lowered, the potential difference between the Cs / black matrix 18 ₁ and 18 ₂ extending from the gate bus line and the pixel electrode 16 is relative to the liquid crystal threshold value. Will grow larger.

It is an object of the present invention to provide a liquid crystal display panel capable of preventing an adverse effect due to disclination when a Cs / black matrix extending from a gate bus line is provided on the side of a pixel electrode.

[0015]

In order to solve the above problems, in a liquid crystal display panel according to the present invention, a pixel electrode, a gate bus line and a drain bus line are connected to a non-linear element, and the non-linear element and the pixel electrode are connected. Cs-on-in which liquid crystal is injected between the TFT substrate arranged in a matrix and the counter substrate having the common electrode, and a part of the pixel electrode overlaps a part of the gate bus line with the insulating film interposed therebetween. G
A liquid crystal molecule having an ate structure and extending from the gate bus line in parallel with the drain bus line with a black matrix extending from the gate bus line in parallel with the drain bus line with an insulating film interposed between the drain bus line and the pixel electrode. Cs and a black matrix extending from the gate bus line are arranged between the drain bus line in the tilt direction and the pixel electrode, and the gate bus is provided between the drain bus line and the pixel electrode in the direction opposite to the tilt direction of the liquid crystal molecules. The structure in which the Cs and the black matrix extending from the line are not arranged is adopted.

In this case, the non-linear element may be connected between the drain bus line and the pixel electrode in the direction opposite to the tilt direction.

Further, in this case, the pixel has a plurality of regions in which the tilt directions of the liquid crystal molecules are different, and the Cs / black matrix extending from the gate bus line at the boundary of each region is the drain bus line or the pixel electrode or the same. C that intersects both and extends from the gate bus line
The s / black matrix is always arranged between the drain bus line in the tilt direction of the liquid crystal molecule and the pixel electrode, and the Cs / black matrix extending from the gate bus line is the drain bus line and the pixel electrode in the opposite direction to the tilt direction of the liquid crystal molecule. It is possible to have a configuration that is not arranged between them.

Further, in another liquid crystal display panel according to the present invention, a pixel substrate, a gate bus line and a drain bus line are connected to the non-linear element, and the non-linear element and the pixel electrode are arranged in a matrix form in a TFT substrate. , A liquid crystal is injected between the common electrode and a counter substrate, and a part of the pixel electrode has a Cs-on-Gate structure in which it overlaps with a part of a gate bus line with an insulating film interposed therebetween. A Cs / black matrix extending from the bus line extends in parallel with the drain bus line with an insulating film interposed between the drain bus line and the pixel electrode, and the drain bus line in the direction opposite to the tilt direction of the liquid crystal molecules near the surface of the TFT substrate. And the black matrix extending from the gate bus line extending between the pixel electrode and the pixel electrode is a drain bus line in the tilt direction of liquid crystal molecules. 1 than Cs and a black matrix that extends from the gate bus line extending between the pixel electrode and
A structure is adopted in which the pixel electrode is overlapped with the pixel electrode by not less than μm and not more than 5 μm.

[0019]

As in the liquid crystal display panel of the present invention, a pixel electrode, a gate bus line and a drain bus line are connected to a non-linear element such as a TFT, and the non-linear element and the pixel electrode are arranged in a matrix in common with a TFT substrate. Cs-on-Gat, in which liquid crystal is injected into a gap between opposed substrates having electrodes, and a part of a pixel electrode is arranged so as to overlap a part of a gate bus line (Cs and black matrix) with an insulating film interposed therebetween.
Cs having e structure and extending from the gate bus line
In addition, a part of the black matrix is arranged in the gap between the drain bus line and the pixel electrode in parallel with the drain bus line via the insulating film, and the direction from the end of the liquid crystal molecule toward the end far from the substrate (the liquid crystal molecule If the Cs / black matrix is provided only between the drain bus line (in the tilt direction) and the pixel electrode, the aperture ratio can be increased and the adverse effect of disclination can be prevented.

In this case, if the TFT is formed between the drain bus line in the tilt direction and the pixel electrode, the Cs / black matrix cannot be increased in order to prevent the interference with the TFT, and therefore the adverse effect of the disclination may occur. Although it cannot be prevented, if a TFT is formed between the drain bus line in the tilt direction and the pixel electrode, it is possible to effectively shield leak light and increase the aperture ratio.

Further, even when the Cs / black matrix extending from the gate bus line is provided between the drain bus line and the pixel electrode on both sides, the overlap between the Cs / black matrix and the pixel electrode in the opposite direction of the tilt direction is larger than that of the other. Then, the generated disclination can be shielded and the aperture ratio can be increased.

Further, in the alignment division type liquid crystal display panel, since the photolithography process or the like is carried out in the manufacturing process, there is a drawback that the alignment stability is poor as compared with a normal liquid crystal display panel, but each alignment direction is different. In a region, when a Cs / black matrix extending from the gate bus line is formed between the drain bus line in the tilt direction and the pixel electrode, liquid crystal molecules are aligned by a lateral electric field generated by a potential difference between the pixel electrode and the Cs / black matrix in each region. It is also possible to improve the alignment stability.

FIG. 1 is a plan view for explaining the principle of a liquid crystal display panel having a Cs-on-Gate structure according to the present invention.
In this figure, 2 is a TFT, 3 is a drain, 3 ₁ , 3
₂ is a drain bus line, 4 is a source, 5 is a gate, 5
Reference numeral ₁ is a gate bus line, 6 is a pixel electrode, 8 ₁ is a Cs / black matrix, and 9 is a counter substrate black matrix. Since this reference numeral is the same as that in FIG. 2, a missing number is generated. According to this figure, Cs-on-G of the first embodiment
The principle of a liquid crystal display panel having an ate structure will be described.

In the liquid crystal display panel having the Cs-on-Gate structure of the present invention, the gate bus line 5 ₁ having the gate 5 and the Cs / black matrix 8 ₁ extending from the gate bus line 5 ₁ are provided on the transparent substrate. And the drain bus lines 3 ₁ and 3 ₂ having a plurality of drains 3 formed thereon with a gate insulating film interposed therebetween and the drains 3
TFTs 2 are formed in a matrix by forming the sources 4 facing each other.
Is formed, a transparent pixel electrode 6 is formed by connecting to the source 4, a TFT substrate is manufactured, and a counter substrate having a counter substrate black matrix 9 is arranged with a gap between the TFT substrate and the TFT substrate. Liquid crystal is injected into the gap between the counter substrate and the counter substrate to form a liquid crystal display panel.

In this case, as shown in this figure, the Cs / black matrix 8 ₁ extending from the gate bus line 5 _{1 is connected} to the drain bus line 3 in the preceding stage (the upper stage in this figure) in the tilt direction of the liquid crystal molecules. _1, 3 ₂ and is provided in parallel to shield the gap between the pixel electrode 6 and the drain bus line 3 _1, 3 _2, to form an electrostatic capacity by having an overlap with the pixel electrode 6 at the same time. In this case, unlike a liquid crystal display panel having a conventional Cs-on-Gate structure, a Cs / black matrix extending from the gate bus line 5 ₁ is formed in the direction opposite to the tilt direction (right side of the pixel in this figure). do not do.

FIG. 2 is a sectional view for explaining the principle of the liquid crystal cell having the Cs-on-Gate structure of the present invention. This figure shows a cross section taken along the line AA 'in FIG. 1, in which 1 is a transparent insulating film, 3 ₁ and 3 ₂ are drain bus lines, 6 is a pixel electrode,
Reference numeral 7 is an insulating film, 8 ₁ is a Cs / black matrix, and 10 is a liquid crystal molecule. Since this reference numeral is the same as that in FIG. 1, there is a missing number. According to this figure, Cs-o of the present invention
The principle of operation of the liquid crystal cell having the n-Gate structure will be described.

In the liquid crystal display panel having the Cs-on-Gate structure of the present invention, the Cs / black matrix 8 ₁ is formed in the tilt direction of the upper surface of the transparent substrate, and the insulating film 7 formed thereon is interposed. The drain bus lines 3 ₁ and 3 ₂ are formed, and the pixel electrode 6 is formed on the upper surface of the transparent insulating film 1.
Liquid crystal having liquid crystal molecules 20 is injected into the gap between the pixel electrode 6 on the upper surface of the transparent insulating film 1 and the common electrode (not shown) on the counter substrate. In this figure, the structure necessary for explaining the state of the liquid crystal molecules 20 is shown, and other structures are omitted.

In order to drive this liquid crystal display panel, a pixel electrode 6 and drain bus lines 3 ₁ and 3 ₂ are connected to a common electrode (not shown) formed on a counter substrate.
3 to 5V is applied, and ± 10 to 15V is constantly applied to the gate bus line (not shown).

Therefore, as shown in this figure, C extending from the gate bus line on the drain bus line 3 ₁ side is used.
A horizontal electric field is generated due to the potential difference between the s / black matrix 8 ₁ and the pixel electrode 6. However, this horizontal electric field is the same as the original tilt direction of the liquid crystal molecules 10, and therefore no problem occurs and the drain bus is not generated. Since the Cs / black matrix is not formed on the line 3 ₂ side, it is possible to solve the problem that the lateral electric field inverts the tilt direction of the liquid crystal molecules 10 to cause disclination.

[0030]

Embodiments of the present invention will be described below. (First Embodiment) FIG. 3 shows the Cs-on-Ga of the first embodiment.
It is a plan view of a liquid crystal display panel having a te structure. FIG.
FIG. 4 is a sectional view of a liquid crystal cell having a Cs-on-Gate structure according to the first embodiment. FIG. 4 shows a cross section taken along the line AA ′ of FIG. 3. In these figures, 1 is a transparent insulating film, 2
Is a TFT, 3 is a drain, 3 ₁ and 3 ₂ are drain bus lines, 4 is a source, 5 is a gate, 5 ₁ is a gate bus line, 6 is a pixel electrode, 7 is an insulating film, 8 ₁ is a Cs / black matrix, Reference numeral 9 is a counter substrate black matrix.

The liquid crystal display panel having the Cs-on-Gate structure of this embodiment has the same structure as that described with reference to FIGS. 1 and 2, and thus the duplicated description is omitted, but the alignment film surface of the TFT substrate is omitted. Is rubbed in the direction of 45 degrees from the lower right to the upper left in the figure, and the liquid crystal molecules near the surface of the alignment film are aligned in the rubbing direction.

That is, the upper left of each liquid crystal molecule in contact with the pixel electrode 6 formed on the transparent insulating film 1 is farther from the substrate surface than the lower right end, and its angle, that is, the tilt angle is about 2 degrees. In this embodiment, the arrow direction from the lower right to the upper left will be referred to as the tilt direction in this case.

The left side of each pixel electrode in this figure, that is, the drain bus lines 3 ₁ in the tilt direction of the liquid crystal molecules,
The interval between 3 ₂ and the pixel electrode 6 is 3 μm, and the Cs / black matrix 8 ₁ is provided on the transparent substrate via the insulating film 7 as a part of the pattern of the gate bus line 5 ₁ in the next stage.

In the liquid crystal display panel having the Cs-on-Gate structure of this embodiment, the liquid crystal operating at 3V is used, and the pixel electrode 6 and the drain bus lines 3 ₁ , 3 are used.
₂ is ± 3 V, -2.5 V is applied to the common electrode of the opposite substrate facing the transparent substrate 1, -12.5 V is applied to the gate bus line 5 ₁ when not writing, and +12.5 V is applied when writing. In this case, the lateral electric field generated by the Cs / black matrix 8 is generated only at the left end of the pixel electrode, and the left side corresponds to the original tilt direction of the liquid crystal molecules, so that disclination does not occur and high display quality is obtained. You can

In the liquid crystal display panel having the Cs-on-Gate structure of this embodiment, the rubbing direction is from the lower right to the upper left in this figure. However, if the rubbing direction, the twist direction, and the twist angle are different, the optimum state is obtained. Will vary accordingly.

(Second Embodiment) FIG. 5 shows Cs of the second embodiment.
It is a top view of a liquid crystal display panel which has a -on-Gate structure. In this figure, 2 is a TFT, 3 is a drain,
Reference numerals 3 ₁ and 3 ₂ denote drain bus lines, 4 sources, 5 gates, 5 ₁ gate bus lines, 6 pixel electrodes, 8 ₁ Cs / black matrix, and 9 counter substrate black matrix.

In the liquid crystal display panel having the Cs-on-Gate structure of this embodiment, a plurality of gates 5 are provided at the right end portion of each pixel electrode 6 on the transparent substrate, which is opposite to the tilt direction of the liquid crystal molecules. The gate bus line 5 ₁ is formed, and the Cs / black matrix 8 ₁ extending from the gate bus line 5 ₁ at the next stage is formed at the left end portion of each pixel electrode 6 in the tilt direction of the liquid crystal molecules. Drain bus lines 3 ₁ and 3 ₂ having a plurality of drains 3 and a source 4 facing the drain 3 are formed on the gate insulating film, TFTs 2 are formed in a matrix, and connected to the source 4. TF by forming a transparent pixel electrode 6
A T substrate is prepared, and a counter substrate having a counter substrate black matrix 9 is arranged with a gap maintained from the T substrate,
Liquid crystal is injected into the gap between the TFT substrate and the counter substrate to form a liquid crystal display panel.

FIG. 6 shows the Cs-on-Gat of the second embodiment.
It is sectional drawing of the liquid crystal cell which has e structure. This figure shows a cross section taken along the line AA 'in FIG.
Is a TFT, 3 ₁ and 3 ₂ are drain bus lines, 6 is a pixel electrode, 7 is an insulating film, and 8 ₁ is a Cs / black matrix. According to this figure, Cs-on-Gat of this embodiment is shown.
The outline of the operation of the liquid crystal cell having the e structure will be described.

In the liquid crystal display panel having the Cs-on-Gate structure of the present invention, the Cs / black matrix 8 ₁ is formed in the tilt direction of the liquid crystal molecules on the upper surface of the transparent substrate, and the black matrix 8 ₁ is formed in the direction opposite to the tilt direction of the liquid crystal molecules. A gate electrode is formed, and a gate insulating film is provided on it. A drain electrode and a source electrode are used as a TFT 2, and drain bus lines 3 ₁ , 3 ₂ are formed through an insulating film 7 formed on a Cs / black matrix 8 ₁ . A pixel electrode 6 is formed on the upper surface of the transparent insulating film 1, and liquid crystal having liquid crystal molecules is injected into a gap between the pixel electrode 6 on the upper surface of the transparent insulating film 1 and a common electrode (not shown) on the counter substrate. There is. This drawing shows a structure necessary for explaining the state of liquid crystal molecules, and other structures are omitted.

In this embodiment, as described above, T
The Cs / black matrix 8 ₁ is formed in parallel with the drain bus line 3 ₁ in the tilt direction of the liquid crystal molecules on the side far from the FT 2 via the insulating film 7.

When driving the liquid crystal display panel of this embodiment, the gate bus line 5 ₁ on the drain bus line 3 ₁ side
Cs and black matrix 8 ₁ extending from the pixel electrode 6
A horizontal electric field is generated by the potential difference between the two, but since this horizontal electric field is the same as the original tilt direction of liquid crystal molecules,
There is no problem, and since the Cs / black matrix is not formed on the drain bus line 3 ₂ side,
This lateral electric field does not cause the problem that the tilt direction of the liquid crystal molecules is inverted and discrimination occurs.

In this case, Cs and black matrix 8 ₁
And TFT2 are formed on the same side of the pixel electrode 6, TF
Since T and Cs / black matrix 8 ₁ interfere with each other, Cs / black matrix 8 extending from the gate bus line 8
_{Since 1} cannot be made long or large, it is difficult to sufficiently block the leaked light between the drain bus line 3 ₁ and the pixel electrode 6, but the drain bus line 3 _{1 in} the tilt direction of the liquid crystal molecules is difficult. If the Cs / black matrix 8 ₁ is formed between the pixel electrode 6 and the pixel electrode 6 and the TFT 2 is formed on the opposite side, the design freedom of the pattern of the Cs / black matrix 8 ₁ is increased, and the leakage light can be effectively shielded. it can.

(Third Embodiment) FIG. 7 shows Cs of the third embodiment.
It is a top view of a liquid crystal display panel which has a -on-Gate structure. In this figure, 2 is a TFT, 3 is a drain,
3 ₁ , 3 ₂ are drain bus lines, 4 are sources, 5 are gates, 5 ₁ are gate bus lines, 6 is pixel electrodes, 8 ₁ ,
8 ₂ is a Cs / black matrix, and 9 is a counter substrate black matrix.

In the liquid crystal display panel having the Cs-on-Gate structure of this embodiment, the gate bus line 5 ₁ having the gate 5 and the tilt direction of the liquid crystal molecules of the gate bus line 5 ₁ are arranged on the transparent substrate. Narrow Cs that extends
A wide Cs extending from the opposite direction to the tilt direction of the liquid crystal molecules of the black matrix 8 ₁ and the gate bus line 5 _1.
A black matrix 8 ₂ is also formed, and drain bus lines 3 ₁ and 3 ₂ having a plurality of drains 3 and a source 4 facing the drain 3 are formed on the black matrix 8 ₂ to form TFTs 2 in a matrix. Then, a transparent pixel electrode 6 is formed to be connected to the source 4 to form a TFT substrate, and a counter substrate having a counter substrate black matrix 9 is arranged with a gap between the TFT substrate and the TFT substrate. Liquid crystal is injected into the gap between the opposite substrates to form a liquid crystal display panel.

FIG. 8 shows the Cs-on-Gat of the third embodiment.
It is sectional drawing of the liquid crystal cell which has e structure. This figure shows a cross section taken along the line AA ′ in FIG. 7, where 1 is a transparent insulating film and 3
₁ and 3 ₂ are drain bus lines, 6 is a pixel electrode, 7 is an insulating film, 8 ₁ and 8 ₂ are Cs / black matrix, and 10 is a liquid crystal molecule. According to this figure, Cs-o of this example
The operation of the liquid crystal cell having the n-Gate structure will be described.

In the liquid crystal display panel having the Cs-on-Gate structure of this embodiment, the upper surface of the transparent substrate is
The narrow Cs / black matrix 8 ₁ and the wide Cs / black matrix 8 ₂ are formed, and the drain bus lines 3 ₁ , 3 ₂ are formed via the insulating film 7 formed thereon,
A pixel electrode 6 is formed on the upper surface of the transparent insulating film 1, and liquid crystal having liquid crystal molecules 10 is injected into a gap between the pixel electrode 6 on the upper surface of the transparent insulating film 1 and a common electrode (not shown) on the counter substrate. ing. In this figure, the structure necessary for explaining the state of the liquid crystal molecules 20 is shown, and other structures are omitted.

In order to drive this liquid crystal display panel, a pixel electrode 6 and drain bus lines 3 ₁ and 3 ₂ are connected to a common electrode (not shown) formed on a counter substrate by ±.
3 to 5V is applied, and ± 10 to 15V is constantly applied to the gate bus line (not shown).

Therefore, as shown in this figure, C extending from the gate bus line on the drain bus line 3 ₂ side is used.
The potential difference between the s / black matrix 8 ₂ and the pixel electrode 6 causes a lateral electric field to invert the liquid crystal molecules 10 to cause disclination. This disclination is in the direction opposite to the tilt direction of the liquid crystal molecules 10. If the overlap with the pixel electrode of 4 is larger than 4 μm, for example, it is possible to shield the leakage light due to the disclination. In this case, a high aperture ratio can be realized by narrowing the overlap of the liquid crystal molecules 10 with the pixel electrodes 6 in the tilt direction to, for example, about 2 μm.

(Fourth Embodiment) FIG. 9 shows Cs of the fourth embodiment.
It is a top view of a liquid crystal display panel which has a -on-Gate structure. In this figure, 2 is a TFT, 3 is a drain,
3 ₁ , 3 ₂ are drain bus lines, 4 are sources, 5 are gates, 5 ₁ are gate bus lines, 6 is pixel electrodes, 8 ₁ ,
8 ₂ and 8 ₃ are Cs / black matrices, and 9 is a counter substrate black matrix.

[0050] In the liquid crystal display panel having a Cs-on-Gate structure of this embodiment, on a transparent substrate, a gate bus line 5 ₁ having a gate 5, the next stage of the gate bus line 5 _first pixel electrode From one end (the left end in this figure) extending in parallel to the drain bus line 3 ₁ to the other end (the right end in this figure) through the intermediate portion (8 ₃ ) that is bent from the middle of the pixel electrode 6 at a right angle. Cs and black matrix 8 ₁ , which extend in parallel with the drain bus line 3 ₂ ,
8 ₂ are formed, drain bus lines 3 ₁ , 3 ₂ having a plurality of drains 3 and a source 4 facing the drains 3 are formed on the gate insulating film to form TFTs 2 in a matrix. A transparent pixel electrode 6 is formed to be connected to the source 4 to form a TFT substrate, and a counter substrate having a counter substrate black matrix 9 is arranged with a gap between the TFT substrate and the TFT substrate. Liquid crystal is injected into the space between them to form a liquid crystal display panel.

Then, as shown in this figure,
The element is divided into upper and lower parts. For example, the upper half of the pixel is the lower right 4
The tilt direction of the liquid crystal molecules is opposite to the upper left of 5 degrees and the upper left of 45 degrees.
And the gate bus line 5₁Cs extending from
Black matrix 8₁, 8 _Two, 8_ThreeThe lower half of the pixel
Is the drain drain on the left side, which is the tilt direction of the liquid crystal molecules.
Inn 3₁Parallel to (8₁), The upper half of the liquid crystal molecules
Drain bus line 3 on the right side, which is the tilt direction_TwoParallel to
(8_Two), The left side of this Cs and black matrix
On the border line of different tilt directions.
(8_Three) Is connected.

FIG. 10 shows the Cs-on-Ga of the fourth embodiment.
It is sectional drawing of the liquid crystal cell which has a te structure, (A) is an AA 'sectional view of FIG. 9, (B) is a BB' sectional view.
In this figure, 1 is a transparent insulating film, 3 ₁ and 3 ₂ are drain bus lines, 6 is a pixel electrode, 7 is an insulating film, and 8 ₁ and 8 ₂
Is a Cs / black matrix, and 10 is a liquid crystal molecule.

The Cs-on-Gate structure of this embodiment is
In the liquid crystal display panel that has half of the pixels (see FIG.
In the upper half), C is applied in the direction opposite to the tilt direction of the liquid crystal molecule 10.
s and black matrix 8_TwoForm (see FIG. 10 (A))
Liquid crystal molecule 1 in the other half of the pixel (lower half of FIG. 9).
Black matrix 8 with Cs in the tilt direction of 0₁Form
(See FIG. 10B), and the insulating film 7 on the
Drain bus line 3 ₁, 3_TwoForming a pixel on it
The electrode 6 is formed, and the pixel electrode 6 and the counter electrode (not shown) are formed.
Liquid crystal having liquid crystal molecules 10 is injected into the gap between
ing.

When driving this liquid crystal display panel, a horizontal electric field is generated in the lower half of the pixel due to the potential difference between the Cs / black matrix 8 ₁ on the drain bus line 3 ₁ side and the pixel electrode 6, but this horizontal electric field is generated. In this region, since the original tilt direction of the liquid crystal molecules 10 is the same, no problem occurs, and in the upper half of the pixel, Cs / black matrix 8 ₂ on the drain bus line 3 ₂ side and the pixel electrode 6 are provided.
A horizontal electric field is generated by the potential difference between the two, but this horizontal electric field is the same as the original tilt direction of the liquid crystal molecules 10 in this region, so that no problem occurs. Further, in this embodiment, in addition to the advantage that the tilt direction of the liquid crystal molecules 10 is not inverted and disclination occurs, the lateral electric field stabilizes the alignment of the liquid crystal molecules 10. Has the effect.

[0055]

As described above, according to the liquid crystal display panel of the present invention, occurrence of disclination is reduced, bright display and alignment stability of liquid crystal molecules are improved, and high display quality and reliability are achieved. It is possible to make a great contribution to the field of use of liquid crystal display panels.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining the principle of a liquid crystal display panel having a Cs-on-Gate structure of the present invention.

FIG. 2 is a sectional view for explaining the principle of a liquid crystal cell having a Cs-on-Gate structure of the present invention.

FIG. 3 is a plan view of a liquid crystal display panel having a Cs-on-Gate structure according to the first embodiment.

FIG. 4 is a cross-sectional view of a liquid crystal cell having a Cs-on-Gate structure according to the first embodiment.

FIG. 5 is a plan view of a liquid crystal display panel having a Cs-on-Gate structure according to a second embodiment.

FIG. 6 is a cross-sectional view of a liquid crystal cell having a Cs-on-Gate structure according to a second embodiment.

FIG. 7 is a plan view of a liquid crystal display panel having a Cs-on-Gate structure according to a third embodiment.

FIG. 8 is a cross-sectional view of a liquid crystal cell having a Cs-on-Gate structure according to a third embodiment.

FIG. 9 is a plan view of a liquid crystal display panel having a Cs-on-Gate structure according to a fourth embodiment.

10 is a cross-sectional view of a liquid crystal cell having a Cs-on-Gate structure according to a fourth embodiment, (A) of FIG.
Sectional view, (B) is a BB 'sectional view.

FIG. 11 is a plan view of a liquid crystal display panel having a conventional Cs-on-Gate structure.

FIG. 12 is a cross-sectional view of a liquid crystal cell having a conventional Cs-on-Gate structure.

[Explanation of symbols]

1 Transparent Insulating Film 2 TFT 3 Drain 3 ₁ , 3 ₂ Drain Bus Line 4 Source 5 Gate 5 ₁ Gate Bus Line 6 Pixel Electrode 7 Insulating Film 8 ₁ , 8 ₂ , 8 ₃ Cs / Black Matrix 9 Opposing Substrate Black Matrix 10 Liquid Crystal molecule

Claims (4)

[Claims] 1. A liquid crystal is provided between a TFT substrate in which a pixel electrode, a gate bus line, and a drain bus line are connected to a non-linear element, and the non-linear element and the pixel electrode are arranged in a matrix, and a counter substrate having a common electrode. Has a Cs-on-Gate structure in which a part of the pixel electrode overlaps a part of the gate bus line with an insulating film interposed therebetween, and the Cs / black matrix extending from the gate bus line is a drain bus line. Cs extending from the gate bus line between the pixel electrode and the drain bus line in the tilt direction of the liquid crystal molecules near the surface of the TFT substrate with the insulating film sandwiched between the pixel electrode and the pixel electrode. A black matrix is arranged and extends from the gate bus line between the drain bus line and the pixel electrode in the direction opposite to the tilt direction of the liquid crystal molecules. The liquid crystal display panel is characterized in that no black Cs / black matrix is arranged. 2. The liquid crystal display panel according to claim 1, wherein the non-linear element is connected between the drain bus line and the pixel electrode in a direction opposite to the tilt direction. 3. A pixel has a plurality of regions in which liquid crystal molecules have different tilt directions, and a Cs / black matrix extending from the gate bus line intersects with the drain bus line and / or the pixel electrode at the boundary between the regions. Then, the Cs / black matrix extending from the gate bus line is always arranged between the drain bus line in the tilt direction of the liquid crystal molecule and the pixel electrode, and the Cs / black matrix extending from the gate bus line in the tilt direction of the liquid crystal molecule. The liquid crystal display panel according to claim 1, wherein the liquid crystal display panel is not disposed between the drain bus line and the pixel electrode in the opposite direction. 4. A liquid crystal is provided between a TFT substrate in which a pixel electrode, a gate bus line and a drain bus line are connected to a non-linear element, and the non-linear element and the pixel electrode are arranged in a matrix, and a counter substrate having a common electrode. Has a Cs-on-Gate structure in which a part of the pixel electrode overlaps a part of the gate bus line with an insulating film interposed therebetween, and the Cs / black matrix extending from the gate bus line is a drain bus line. And extends in parallel with the drain bus line with an insulating film sandwiched between the pixel electrode and the gate bus line extending between the drain bus line and the pixel electrode in the direction opposite to the tilt direction of the liquid crystal molecules near the surface of the TFT substrate. The Cs / black matrix extends from the gate bus line extending between the drain bus line in the tilt direction of the liquid crystal molecules and the pixel electrode. 1 more than Cs and black matrix
A liquid crystal display panel, characterized in that the pixel electrodes largely overlap with the pixel electrodes by 5 μm or more and 5 μm or less.